Magnet exciting coil adjusting and fixing device for vertical cyclotron
By employing a combined structure of upper and lower magnetic yokes, fixed supports, excitation coils, and magnetic yokes in a vertical cyclotron, and utilizing symmetrical pressure at the four corners and pads to fix the excitation coils, the problem of unsuitable fixing in vertical cyclotrons is solved, achieving high-precision adjustment and stable fixing, while reducing costs and space occupation.
Patent Information
- Application Number
- CN202422724096.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-08
AI Technical Summary
The existing method of fixing the excitation coil is not suitable for vertical cyclotrons and cannot achieve high-precision adjustment.
It adopts a combination structure of upper and lower magnetic yokes, fixed supports, excitation coils, front and rear magnetic yokes and screws. The excitation coils are fixed by axial and radial pressure symmetrically at the four corners. The side pads and upper pads form a stable fixing method, and the stability is enhanced by oxygen-free copper conduit and epoxy resin insulating shell.
It achieves reliable and stable fixing of the excitation coil of the vertical cyclotron, high-precision adjustment, simple structure, small space occupation, low cost, and is suitable for vertical cyclotrons with high-precision assembly requirements.
Smart Images
Figure CN223539417U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electromagnetic field technology, specifically to an excitation coil adjustment and fixing device for a vertical cyclotron accelerator. Background Technology
[0002] The working principle of an excitation coil is that when current flows through the conductive coil, magnetic field lines pass along the center of the coil, thus generating a corresponding magnetic field. For a constant direct current, a constant magnetic field is generated; the larger the current, the stronger the magnetic field, until saturation. When an alternating current flows through it, an alternating magnetic field is generated. Besides the current magnitude, the strength of the magnetic field is also closely related to factors such as the cross-sectional shape of the conductor, the winding structure, the overall size, the installation location, and the magnetic permeability of the surrounding medium. Excitation coils are typically used in symmetrical combinations with iron cores to enhance the magnetic field strength. In nuclear technology applications such as particle accelerators and high-energy beam transport lines, extremely high magnetic field strength is often required to create and control high-energy charged particle beams. This necessitates the design of large magnets and excitation coils. Furthermore, for more precise magnetic field control, high-precision assembly and sufficiently stable support are required for both the magnets and the excitation coils.
[0003] As per the instruction manual Figure 1 As shown, this is a conventional coil fixing structure for a bedroom electron accelerator. The excitation coil is fixed to the side of the generating electrode inside the accelerator's steel cylinder via multiple internal and external support plates and brackets. This fixing method occupies a large space, has a complex connection structure, numerous supporting parts, low assembly precision, and lacks the function of high-precision coil adjustment. It is only suitable for accelerators or electromagnet equipment with large installation space and low precision requirements. This structure is not suitable for cyclotron excitation coils with limited space, large coil size, and high assembly precision.
[0004] As per the instruction manual Figure 2 As shown, this is a magnet coil structure of an existing medical cyclotron accelerator, consisting of two sets of magnetic poles, side magnets, a yoke cover plate, and an excitation coil symmetrically combined. The excitation coil is arranged in the gap between the magnetic pole and the yoke, concentric with the magnetic pole profile and parallel to the magnetic pole surface, and supported by a bracket on the side of the yoke. This support and fixing method is only suitable for bedroom accelerators, where the excitation coil is arranged horizontally, and the support bracket only maintains the gravity direction on one side of the coil. It lacks the device and means for high-precision horizontal adjustment and is not suitable for vertical cyclotron accelerators with high assembly precision and vertically arranged coils. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide an excitation coil adjustment and fixing device for a vertical cyclotron, so as to solve the problem that the existing cyclotron excitation coil fixing method is only suitable for cyclotrons arranged in bedrooms and cannot be applied to vertical cyclotrons. The second purpose is to solve the technical problem that the existing cyclotron excitation coil fixing method does not have the function of high-precision coil position adjustment.
[0006] To achieve the above objectives, this utility model employs the following technical solution:
[0007] An excitation coil adjustment and fixing device for a vertical cyclotron accelerator includes upper and lower magnetic yokes, fixed supports, an excitation coil, a vacuum chamber, front and rear magnetic yokes, and screws. Two front and rear magnetic yokes are provided, positioned one in front of the other. Two upper and lower magnetic yokes are also provided, positioned vertically in the middle of the two front and rear magnetic yokes. The excitation coil is vertically arranged on the inner plane of the front and rear magnetic yokes, concentric with the vacuum chamber and the magnetic poles on the inner plane of the front and rear magnetic yokes. Each excitation coil is fixed by four sets of fixed supports. The four sets of fixed supports are symmetrical about the four corners of the excitation coil. Each set of fixed supports has a screw on its top surface and is fixed to the surface of the front and rear magnetic yokes by the screws.
[0008] As a preferred embodiment of this utility model, a lower pad is arranged between the excitation coil and the front and rear magnetic yokes to ensure the required gap between the coil and the front and rear magnetic yokes.
[0009] As a preferred embodiment of this invention, the excitation coil has side pads on its arc-shaped side surface. These side pads are respectively arranged on the arc-shaped side surface and the upper plane of the excitation coil. They are pressed against the coil surface by screws on the fixing support, ultimately forming symmetrical axial and radial pressures on the coil. Each pad is tightly attached to the coil and its corresponding fixing support. Under the pressure of the screws, the two side pads symmetrically positioned relative to the magnetic pole center exert opposing pressure on the excitation coil, ensuring the coil remains stable and stationary, preventing it from easily shifting.
[0010] As a preferred technical solution of this utility model, the upper surface of the excitation coil is provided with an upper pad.
[0011] Side pads are respectively arranged on the arc-shaped side surface and the top plane of the excitation coil. They are pressed and adhered to the coil surface by screws on the fixing support, ultimately forming symmetrical axial and radial pressures on the coil. Each pad is tightly attached to the coil and the corresponding fixing support. Under the pressure of the screws, the two side pads symmetrical about the center of the magnetic poles form a counter-pressure on the excitation coil, making the coil stable and stationary, and preventing it from easily shifting.
[0012] As a preferred technical solution of this utility model, the excitation coil is usually made of oxygen-free copper wire tube with an inner circle and an outer square, and an insulating shell is formed by epoxy resin casting through a mold.
[0013] As a preferred embodiment of this utility model, the surface of the fixed support is provided with reinforcing ribs.
[0014] This invention supplements the fixing and adjustment method of the excitation coil of a vertical cyclotron accelerator. The fixing method is reliable and stable, with a simple structure, small size, and low manufacturing cost. It is beneficial for people to design the coil structure of vertical cyclotron accelerators or large vertical electromagnet equipment in the future. At the same time, it provides a reliable adjustment means for cyclotron accelerators with high-precision assembly requirements for the excitation coil. The adjustment method is convenient and has high adjustment accuracy.
[0015] This utility model is applicable to the fixed support of the excitation coil of a vertical cyclotron accelerator, and the support effect is reliable and stable;
[0016] This utility model has a high-precision adjustment function for large excitation coils, and the adjustment method is simple and convenient;
[0017] This utility model has a small footprint, simple structure, low manufacturing cost, and is easy to install and disassemble.
[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the coil fixing structure of an existing bedroom electron accelerator described in the background art.
[0020] Figure 2 This is a schematic diagram of the magnet coil structure of a medical cyclotron accelerator described in the background art;
[0021] Figure 3 This is a schematic diagram of the structure of the magnet coil of the vertical cyclotron accelerator of this utility model. Figure 1 ;
[0022] Figure 4 This is a schematic diagram of the structure of the magnet coil of the vertical cyclotron accelerator of this utility model. Figure 2 ;
[0023] Figure 5 This is a schematic diagram of the structure of the coil fixing support of this utility model;
[0024] In the diagram: 1. Upper and lower magnetic yokes; 2. Fixed support; 3. Excitation coil; 4. Vacuum chamber; 5. Front and rear magnetic yokes; 6. Lower pad; 7. Upper pad; 8. Screw; 9. Side pad; 10. Reinforcing rib. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0028] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0029] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable. Example 1
[0030] Please see Figure 1-5This invention provides a technical solution: an adjustment and fixing device for the excitation coil 3 of a vertical cyclotron accelerator, comprising upper and lower magnetic yokes 1, fixed supports 2, excitation coil 3, vacuum chamber 4, front and rear magnetic yokes 5, and screws 8. Two front and rear magnetic yokes 5 are provided, positioned one in front of the other. Two upper and lower magnetic yokes 1 are provided, positioned one in front of the other in the middle of the two front and rear magnetic yokes 5. The excitation coil 3 is vertically arranged on the inner plane of the front and rear magnetic yokes 5, concentric with the vacuum chamber 4 and the magnetic poles on the inner plane of the front and rear magnetic yokes 5. Each excitation coil 3 is fixed by four sets of fixed supports 2. The four sets of fixed supports 2 are symmetrical about the four corners of the excitation coil 3. Each set of fixed supports 2 has a screw 8 on its top surface, and each set of fixed supports 2 is fixed to the surface of the front and rear magnetic yokes 5 by the screws 8.
[0031] A lower pad 6 is arranged between the excitation coil 3 and the front and rear magnetic yokes 5 to ensure the required gap between the coil and the front and rear magnetic yokes 5.
[0032] Specifically, in this embodiment, side pads 9 are provided on the arc-shaped side surface of the excitation coil 3. The side pads 9 are respectively arranged on the arc-shaped side surface and the upper plane of the excitation coil 3. They are pressed and attached to the surface of the excitation coil 3 by the screws 8 on the fixing support 2, ultimately forming symmetrical axial and radial pressures on the excitation coil 3. Each pad is tightly attached to the excitation coil 3 and the corresponding fixing support 2. Under the pressure of the screws 8, the two side pads 9, which are symmetrical about the center of the magnetic poles, form a counter-pressure on the excitation coil 3, making the excitation coil 3 stable and stationary, and preventing it from easily moving.
[0033] An upper pad 7 is provided on the upper surface of the excitation coil 3.
[0034] Specifically, in this embodiment, the side pads 9, respectively arranged on the arcuate side surface and the upper plane of the excitation coil 3, are pressed and adhered to the surface of the excitation coil 3 by the screws 8 on the fixing support 2, ultimately forming symmetrical axial and radial pressures on the excitation coil 3. Each pad is tightly attached to the excitation coil 3 and the corresponding fixing support 2. Under the pressure of the screws 8, the two side pads 9, which are symmetrical about the center of the magnetic poles, form a counter-pressure on the excitation coil 3, making the excitation coil 3 stable and stationary, and preventing it from easily shifting.
[0035] Specifically, in this embodiment, the excitation coil 3 is typically made of oxygen-free copper wire tube with an inner circle and an outer square, and an insulating shell is formed by epoxy resin casting through a diaphragm.
[0036] Specifically, in this embodiment, the surface of the fixed support 2 is provided with a reinforcing rib plate 10, and the support strength of the fixed support 2 is enhanced by adding a welded reinforcing rib plate 10 to the rear side of the fixed support 2. Example 2
[0037] Please see Figure 1-5 This is another technical solution provided by the present invention. This embodiment has the same features as the above embodiment 1, and the similarities will not be described in this embodiment. The specific differences are as follows:
[0038] An adjustment and fixing device for the excitation coil 3 of a vertical cyclotron accelerator includes upper and lower magnetic yokes 1, fixed supports 2, excitation coil 3, vacuum chamber 4, front and rear magnetic yokes 5, and screws 8. Two front and rear magnetic yokes 5 are provided, positioned one in front of the other. Two upper and lower magnetic yokes 1 are provided, positioned one above the other in the middle of the two front and rear magnetic yokes 5. The excitation coil 3 is vertically arranged on the inner plane of the front and rear magnetic yokes 5, concentric with the vacuum chamber 4 and the magnetic poles on the inner plane of the front and rear magnetic yokes 5. The excitation coil 3 on each side is fixed by four sets of fixed supports 2. The four sets of fixed supports 2 are symmetrical about the four corners of the excitation coil 3. Each set of fixed supports 2 has a screw 8 on its top surface and is fixed to the surface of the front and rear magnetic yokes 5 by the screws 8.
[0039] This utility model supplements the fixing and adjustment method of the excitation coil 3 of the vertical cyclotron accelerator. The fixing method is reliable and stable, the structure is simple and small in size, and the manufacturing cost is low. It is beneficial to people's future design of coil structure for vertical cyclotron accelerators or large vertical electromagnet equipment. At the same time, it provides a reliable adjustment means for cyclotron accelerators with high-precision assembly requirements for the excitation coil 3. The adjustment method is convenient and the adjustment accuracy is high.
[0040] As per the instruction manual Figure 3 The diagram shows the magnet coil structure of a vertical cyclotron. The excitation coil 3 is vertically arranged on the inner plane of the front and rear magnetic yokes 5, concentric with the vacuum chamber 4 and the magnetic poles. Each excitation coil 3 is fixed by four sets of fixed supports 2. The four sets of fixed supports 2 are symmetrical with respect to the four corners of the excitation coil 3 and are fixed to the surface of the front and rear magnetic yokes 5 by screws 8. The magnet and excitation coil 3 are symmetrically combined on both sides.
[0041] A lower pad 6 is placed between the excitation coil 3 and the front and rear magnetic yokes 5 to ensure the required gap between the coil and the front and rear magnetic yokes 5. Side pads 9 and upper pads 7 are respectively placed on the arc-shaped side surface and upper plane of the excitation coil 3. They are pressed and adhered to the surface of the excitation coil 3 by screws 88 on the fixed support 2, ultimately forming symmetrical axial and radial pressures on the excitation coil 3. Each pad is tightly attached to the excitation coil 3 and the corresponding fixed support 2. Under the pressure of the screws 8, the two side pads 9, symmetrical about the center of the magnetic poles, exert a counter-pressure on the excitation coil 3, making the excitation coil 3 stable and stationary, preventing it from easily shifting.
[0042] The excitation coil 3 of a cyclotron accelerator is typically made of oxygen-free copper tubing with an inner circle and an outer square, and an insulating shell is formed by casting epoxy resin through a mold. However, epoxy resin has relatively lower strength and hardness compared to metal. In the fixing structure of this invention, the force conversion through the pads ensures that the four corners of the excitation coil 3 have a larger force-bearing area, effectively reducing the pressure at the fixing position and preventing the epoxy resin on the surface of the excitation coil 3 from being squeezed and damaged. Simultaneously, the pads should be made of a low-hardness 1-series aluminum alloy to better protect the shell of the excitation coil 3. It should be noted that the inner surface of the side pad 9 should be machined with an arc surface according to the outer diameter of the excitation coil 3 to ensure that the sides of the excitation coil 3 have sufficient force-bearing area.
[0043] During the installation of the excitation coil 3, the radial displacement of the excitation coil 3 can be controlled by adjusting the screws 8 on the side of the corresponding fixing support 2. After positioning with the assistance of other position measuring instruments, all the screws 8 on the side of the fixing support 2 are tightened, thus completing the adjustment and fixing of the excitation coil 3. The screws 8 form an adjustment movement through the threaded holes of the fixing support 2, and their adjustment direction is two-dimensionally adjustable in the vertical plane, with an adjustment accuracy of ±0.05mm. The adjustment method is simple and easy to understand. For a vertical cyclotron, the vertically arranged excitation coil 3 will tend to sag due to gravity, and there will inevitably be a gap between the inner side of the excitation coil 3 and the outer side of the magnetic pole and vacuum chamber 4. This adjustment structure can ensure the concentricity of the excitation coil 3 with the magnetic pole and vacuum chamber 4, ensuring that the gap is uniform and that there is no internal force on the excitation coil 3, thus ensuring the quality of the magnetic field ultimately generated by the cyclotron.
[0044] For excitation coils 3 that are large in size and weight, the support strength of the fixed support 2 can be enhanced by adding welded reinforcing ribs 10 to the rear side of the fixed support 2. The fixed support 2 is preferably made of stainless steel, which has higher strength and less impact on the magnetic field compared to other steel and organic materials. This fixing structure effectively utilizes the gap between the magnetic poles and the yoke, occupies little space, has simple parts and structure, low cost, and is very convenient to install and disassemble.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A device for adjusting and fixing the excitation coil of a vertical cyclotron accelerator, comprising upper and lower magnetic yokes (1), a fixed support (2), an excitation coil (3), a vacuum chamber (4), front and rear magnetic yokes (5), and screws (8), characterized in that: Two front and rear magnetic yokes (5) are provided, one in front and one behind. Two upper and lower magnetic yokes (1) are provided, one in front and one behind the other. The excitation coil (3) is vertically arranged on the inner plane of the front and rear magnetic yokes (5). The excitation coil (3) is concentric with the vacuum chamber (4) and the magnetic pole on the inner plane of the front and rear magnetic yokes (5). The excitation coil (3) on each side is fixed by four sets of fixed supports (2). The four sets of fixed supports are symmetrical with respect to the four corners of the excitation coil (3). Each set of fixed supports (2) has a screw (8) on its top surface. Each set of fixed supports (2) is fixed to the surface of the front and rear magnetic yokes (5) by screws (8).
2. The excitation coil adjustment and fixing device for a vertical cyclotron accelerator according to claim 1, characterized in that: A lower pad (6) is arranged between the excitation coil (3) and the front and rear magnetic yokes (5).
3. The excitation coil adjustment and fixing device for a vertical cyclotron accelerator according to claim 1, characterized in that: The excitation coil (3) has a side pad (9) on its arc side.
4. The excitation coil adjustment and fixing device for a vertical cyclotron accelerator according to claim 1, characterized in that: The upper surface of the excitation coil (3) is provided with an upper pad (7).
5. The excitation coil adjustment and fixing device for a vertical cyclotron accelerator according to claim 1, characterized in that: The excitation coil (3) is usually made of oxygen-free copper wire tube with an inner circle and an outer square, and an insulating shell is formed by epoxy resin casting through a diaphragm.
6. The excitation coil adjustment and fixing device for a vertical cyclotron accelerator according to claim 1, characterized in that: The surface of the fixed support (2) is provided with a reinforcing rib plate (10).